By all means use the ailerons.

In the instructions, the greater dihedral is for the 3 channel no aileron version. The lessor dihedral is for the version with ailerons.

You get accustumed to mostly flying a model in the air with your right hand. Most modern day model airplanes will actually turn rather well without using the rudder. As you gain experience, you will be using the rudder also with you left hand.

These movements need to become automatic for you. With no ailerons, people normally put the rudder over on the right. This leaves nothing for the left hand to do except work the throttle.

Anyway, what I'm getting at is that its better to just start out with ailerons. Its no harder than just using rudder and elevator. It will cause you trouble later on to change back and forth.

I'm sure you will enjoy this plane very much. It can be a beauty.

Enjoy,

Jim